CDRIVER-4512 do not use execdir (#1516)

Resolves insecure error produced by `find`

Author: kevinAlbs

.evergreen/config_generator/components/funcs/fetch_det.py

@@ -21,7 +21,7 @@ class FetchDET(Function):
         bash_exec(
             command_type=EvgCommandType.SETUP,
             working_dir="drivers-evergreen-tools",
-            script='find .evergreen -type f -name "*.sh" -execdir chmod +rx "{}" \;',
+            script='find .evergreen -type f -name "*.sh" -exec chmod +rx "{}" \;',
         ),
 
         # python is used frequently enough by many tasks that it is worth

.evergreen/generated_configs/functions.yml

@@ -180,7 +180,7 @@ functions:
         working_dir: drivers-evergreen-tools
         args:
           - -c
-          - find .evergreen -type f -name "*.sh" -execdir chmod +rx "{}" \;
+          - find .evergreen -type f -name "*.sh" -exec chmod +rx "{}" \;
     - command: subprocess.exec
       type: setup
       params: